body {
    background-color: #fbfcfb; 
    margin: auto;
}
p, h1 {
    text-align: center;
}

h4 {
    text-align: center;
}
input, button {
    display: block;
    margin: 5px auto;
    padding: 5px;
}
input, label {
    display: block;
    margin: 10px auto;
    text-align: center;
}
.header {
    width: 100%;
    height: 270px;

    background-image: url("limsjap.png");
    background-size: contain; /* 🔥 clave */
    background-position: center;
    background-repeat: no-repeat;

    /* 🔥 degradado en bordes */
    -webkit-mask-image: radial-gradient(circle, black 90%, transparent 90%);
    mask-image: radial-gradient(circle, black 90%, transparent 90%);
}